If you mean multiple line headers, this has been implemented. Look at qt-apps.
If you mean frozen rows or frozen columns, you have to implement it yourself by placing another table between the header of the main table and its contents. QAbstractScrollArea::setViewportMargins() will help you do that.
Same as above.2) Fixed (last) row (often used when showing totals, counts, etc. in the last row)
QHeaderView::setMovable()3) Rearranging columns using drag and drop
QHeaderView::setResizeMode()4) Automatically size row/column width for individual or multiple columnsYou need to reimplement QHeaderView::paintSection() (and possibly QHeaderView::sectionSizeFromContents()) for that.5) Column and row headers with mutiline text
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